The Beatles, Pink Floyd, Fleetwood Mac, The Eagles
Coldplay, Guster, Paramore, Muse, Foo Fighters, Two Door Cinema Club
Super Mash Bros, Girl Talk, White Panda, DJ Earworm, Bruneaux, Norwegian Recycling, Mashup-Germany
Robyn, Maroon 5, One Republic, Ke$ha, Rihanna, Kanye
Madeon, Avicii, Pretty Lights
90s pop of questionable taste
Basically everything. Great mashups and interesting covers occupy a special place in my heart.
Good Omens (Gaiman/Pratchett), Hitchhiker's Guide (Adams), Mistborn (Sanderson), Bellwether (Willis), The Chosen (Potok), Stephen King, J.K. Rowling, Robin McKinley, Patrick Rothfuss
Plays, movies, and shows
Shakespeare and Gilbert & Sullivan
The Avengers, The Breakfast Club, Clue, Help!, Love Actually, The Princess Bride, Scott Pilgrim vs. the World, Stardust, Star Wars
Stargate SG-1 and Atlantis, some Star Trek, Doctor Who, Community, Arrested Development, Sherlock, Archer
Video Games (bonus category!)
Mario Kart (Wii, mostly), Knights of the Old Republic, Mass Effect, Arkham Asylum/City/Origins, Borderlands, Monkey Island, Kingdom Hearts, Portal
And... food? Sure!